Sensitivity of the LHC isolated-gamma+jet data to the parton distribution functions of the proton

Abstract

We study the impact of differential isolated-photon+jet cross sections measured in proton-proton collisions at a center-of-mass energy of sqrt{s} = 7 TeV on the parton distribution functions (PDF) of the proton. Next-to-leading order perturbative QCD (pQCD) calculations complemented with the NNPDF2.1 parton densities, and a Bayesian PDF reweighting method are employed. We find that although the current data provide only mild constraints to the parton densities, future gamma-jet measurements with reduced experimental uncertainties can improve our knowledge of the gluon density over a wide range of parton fractional momenta x as well as of the quarks at low-x.

10 pages, 6 figures. Minor mods to match version accepted for publication in EPL

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• Parton distributions for the LHC
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• Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
• Study of Monte Carlo approach to experimental uncertainty propagation with MSTW 2008 PDFs
• Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
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Cited by in corpus (26)

• The Structure of the Proton in the LHC Precision Era
• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
• Progress in the Determination of the Partonic Structure of the Proton
• PDF reweighting in the Hessian matrix approach
• Constraints on the gluon PDF from top quark pair production at hadron colliders
• Measurement of the cross section for inclusive isolated-photon production in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
• aMCfast: automation of fast NLO computations for PDF fits
• Parton momentum and helicity distributions in the nucleon
• Measurement of the triple-differential cross section for photon + jets production in proton-proton collisions at sqrt(s) = 7 TeV
• Dynamics of isolated-photon plus jet production in pp collisions at sqrt(s)=7 TeV with the ATLAS detector
• Isolating Prompt Photons with Narrow Cones
• Driving Miss Data: Going up a gear to NNLO
• Measurement of differential cross sections for inclusive isolated-photon and photon+jet production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• High-$E_{\mathrm{T}}$ isolated-photon plus jets production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector
• Measurement of the inclusive isolated-photon cross section in $pp$ collisions at $\sqrt{s}=13$ TeV using 36 fb${}^{-1}$ of ATLAS data
• Isolated photon and photon+jet production at NNLO QCD accuracy
• Measurement of the ratio of cross sections for inclusive isolated-photon production in $pp$ collisions at $\sqrt{s}=13$ and $8$ TeV with the ATLAS detector
• Inclusive-photon production and its dependence on photon isolation in $pp$ collisions at $\sqrt{s}=13$ TeV using 139 fb${}^{-1}$ of ATLAS data
• Single Photon Production at Hadron Colliders at NNLO QCD with Realistic Photon Isolation
• Measurements of triple-differential cross sections for inclusive isolated-photon+jet events in pp collisions at $\sqrt{s}=$ 8 TeV
• Consistent simulation of direct-photon production in hadron collisions including associated two-jet production
• Summary of the Topical Workshop on Top Quark Differential Distributions 2014
• The P-P(P) cross-section of isolated single-photon production in the $k_t$-factorization and different angular ordering unintegrated parton distributions frameworks
• Measurements of the differential cross sections of the production of Z + jets and $\gamma$ + jets and of Z boson emission collinear with a jet in pp collisions at $\sqrt{s}=$ 13 TeV
• Parton Distributions in the Higgs Boson Era
• Experimental QCD summary (ICHEP 2020)